反旋转阀瓣
Anti-rotation Disc

　　阀瓣上的两个整体铸造的耳柄防止阀瓣在运行期间出现旋转现象。这个独特的特征通过消除阀瓣在严酷的应用中出现旋转的现象，来帮助延长阀门的使用寿命。
　　Two integrally cast lugs on the disc prevent the disc from spinning in service. This exclusive feature helps extend valve life in difficult services by eliminating disc spinning.

外置杠杆和压铁
Outside Lever and Weight

　　所有外露铰链销旋启式止回阀，通径在DN300及以下，都可以配置备选的外置杠杆和压铁。这种装置可用来实现阀瓣的阻尼，或帮助止回阀阀瓣根据定向实现关闭。通过采用杠杆和压铁来实现阀瓣的反平衡，这样阀门就可以在更低的流速下开启。通过压铁位置的调整来增加阀瓣的重量，压铁越靠近，阀门关闭速度就越快。在订购这种装置时，请指定所需的压铁位置。
　　All external hinge pin swing check valves 12" and smaller are available with an optional outside lever and weight. This feature can be used to either dampen or assist closing of the check valve disc depending on orientation. By using the lever and weight to counter-balance the disc, the valve opens at lower flow rates. By orienting the weight to add to the disc weight, the weight closes the valve faster. Please specify which orientation is desired when requesting this feature.

备选阀座类型
Optional Seat Types

　　坚固耐用，全端口阀座环已经对阀座宽度加以控制，以实现最大的密封力。我们备选螺纹结构允许简单、低成本的更换。对于高温应用，阀座环应该采用锁定焊接或密封焊接。请指定。阀座面可以采用许多种材料，包括Co-Cr-A合金硬面，这是常用的、优秀的耐磨和不容易损坏的硬面材料。参阅第33页，了解备选阀内件。
　　Heavy duty, full ported seat rings have controlled seat width to provide maximum sealing force. Our optional threaded design allows simple, low cost replacement. For high temperature service, seat rings should be lock welded or seal welded. Please specify. Seat ring facings are available in many materials, including Co-Cr-A alloy hardfacing, commonly specified for its excellent resistance to wear and damage. See page 33 for available trims.

标准阀盖连接
Standard Bonnet Joints

　　美国太平洋阀门上的阀体/阀盖连接结构适用于恶劣的应用环境，可配置足够数量的阀盖螺栓。
　　这些标准的连接随着阀门压力等级的不同而有所不同。这些标准连接如下所示。
　　Body/bonnet joints on Pacific valves are designed for rugged services with a more than adequate number of bonnet bolts.
　　The standard joint varies, depending on valve class. These standard joints are shown.

压力等级Class 150
Class 150

　　标准连接是圆形外螺纹和内螺纹结构，配置波纹金属垫圈。这种外螺纹和内螺纹连接限制了垫圈的外径和内径。作为备选件，如果用户要求，也可提供其它材料的垫圈。
　　Standard joint is a circular male and female configuration with a corrugated metal gasket. The male and female joint confines the gasket O.D and I.D. When specified, gaskets of other materials are available as an option.

压力等级Class 300
Class 300

　　圆形外螺纹和内螺纹阀盖连接是自行对准调整并且封装的垫圈。我们标准的垫圈是双重封装的金属。如果用户要求，这些压力等级的阀门也可提供螺旋盘绕或环连接垫圈。
　　The circular male and female bonnet joint is self-aligning and encapsulates the gasket. Our standard gasket is double jacketed metal. Valves in these classes are also available with spiral wound or ring joint gaskets when specified.

压力等级Class 600 - 1500
Class 600-1500

　　这种圆形环状连接阀盖密封经过实践证明是目前最好的螺栓高压阀盖连接。这种环连接可自行调整对准；除非出现物理损坏，否则垫圈可以重复使用。如果用户要求，对于这些压力等级的阀门，我们也可以提供螺旋盘绕垫圈。
　　The circular ring joint bonnet seal has proven to be the best bolted high pressure bonnet joint available. The ring joint is self-aligning; the gasket maybe reused unless it is physically damaged. Valves in these classes are also available with spiral wound gaskets when specified.